"If an acquirer thinks you're going to stick around no matter what, they'll be more likely to buy you, because if they don't and you stick around, you'll probably grow, your price will go up, and they'll be left wishing they'd bought you earlier..." -- The Hardest Lessons for Startups To Learn #5
Depends how long is long. Fred Wilson stated that their latest VC is about having a war-chest for the purpose of convincing people that they're going to be around long enough to make it worth your while to build twitter-based services. http://www.youtube.com/user/insiteny